Copper mold



COPPER `MOLD W. HA PEIRCE Filed March 14, 1934 MN I m. R1 .Y m N m i a,WLM m [.m A Wm lmmlzl um Lm QN Qu NN EQ C @N NRM@ | I l l l PatentedJuly 21, 1936 UNITED STATES PATENT o'FElcE COPPER MOLD William E.Peirce, Baltimore, Md., assigner to American Smelting and- RefiningCompany, New York, N. Y., a corporation of New ,Jersey Application March14, 1934, SeriaiNo.'715,386

3 claims. (ci. 22-153) This invention relates to casting apparatus andmore particularly to molds for the casting of metals having high heatconductivity.

The invention relates toa mold made in two water cooled sections to forma closed casting space whereby thecontour of the mold cavity may beeasily machined so as to produce accurate and precise dimensions with a.minimum of expense and without sacrificing any of the heat lotransferring properties of the mold.

The invention also relates to an arrangement for cooling the mold insuch a manner as effectively to absorb the heat from the molten metalpoured into the mold, and convey it rapidly away 1- from the moldsections thereby preventing any deterioration of the mold sectionsthrough contact with the hot molten metal being cast.

A further feature of the invention consists in providing a new andimproved cradle or yoke permitting easy manipulation of the mold,whereby it may be readily inverted so that the casting, whensufficiently hardened or solidified, may be removed from the moldthrough the open top end thereof.

The invention also consists in certain new and original features ofconstruction and combinations of parts hereinafter set forth andclaimed.

Although the novel features which are belleved to be characteristic ofthis invention lwill be particularly pointed out in the claims appendedhereto, the invention itself, as to its objects and advantages, and themanner in whichl it may be carried out. may be better undestood byreferring to the following description 35 taken in connection with theaccompanying drawing forming a part thereof, in which Fig. 1 is a sideelevation of a mold and the supporting yoke therefor;

Fig. 2 is a top section on the line 2-,2 of Fig. 1; o Fig. 3 is an endsection on the line 3-3 of Fig. 1:

Fig. 4 is an end view of the mold and yoke; and Fig. 5 is a side sectionon the line 5-5 of Fig. 2. Referring to the drawing, sections I and 2 ofthe mold are preferably made by casting blocks of copper ofapproximately the desired shape The inner adjacent faces of the sectionsare `machined to form the casting chamber to the desired degree ofaccuracy.

Suitable cooling passages are provided in both sections of the mold.These may be formed byJ with several vertical connecting pipes, thusforming a number of parallel passages for the cooling iiuid, such aswater, owing from the inlet to the outlet in each section. The lowerhorizontal pipe may be the inlet pipe and the 5 upper one the outletpipe. Thus, any steam which may be formed during castingiwill be car`-ried to the outlet.

The complementary'recesses forming the casting space 3 may be cut todifferent depths in 10 themold sections. For example, five-eighths ofthe width of the casting space may be comprised in the recess in sectionI and three-eighths of the indentation in the recess of section 2. Bythis construction the casting space may be divided in any appropriateproportions desired.

The mold may be supported in a suitable yoke or cradle such as the Ushaped yoke 5 formed of Ya single steel casting having hol-low ends 'Iand la and connecting struts 8 between these 20 ends forming the supportfor the mold. The yoke is provided at its ends with trunnions B and 6awhich are arranged'in alignment with each other and may be journalled ina suitable carriage (not shown).

The two sections of the mold are secured together by bolts 9 passingthrough both of these sections. The mold is also secured to thesupporting yoke by means of these bolts, some of which pass throughbridging struts 8 between 30 the ends of the yoke..

Preferably, the bottom gate 4 of the mold is movable and is machined tofit tightly against the bottom of the mold to close the lower end ofcasting space 3. A gate arm Il) may be keyed or splined to a shaft I4which extends across the lower park of yoke 5. Gate arm I0 has awedge-shaped up-turned end II which is tted into a V slot I2 cut in thelower side of the gate piece 4. The wedge-shaped end of arm I0 is 40held in slot I2 by a pin I3 passing through the sides of the slot andthe wedge-shaped tip of the arm. There is thus formed a rocking jointwhereby the gate may be tilted slightly one way or the other to `enableclose alignment with the bottom ofthe mold.

`A lever arm I5 is also keyed to the shaft I4 at the left hand endthereof whereby rotation of the lever arm will rotate the gate arm I0and open or close the gate. Latching means, such as latch or hook I6,pivoted on the end of the mold section 2 engages the end of lever arm I5whereby the gate may be locked against the bottom of the mold. The latchI6 is journalled on an eccentric sheave I1 which is mounted to rotate'onpin I8 55 Fitted pipes 22 and 23 connect the passage 36 to a. the intakeports for the uid circulating systems tapped into the edge of moldsection 2. A handle y in the ends of sections I and 2 of the mold.

Flexible means, such as metallic hose 24, connects the same passage 30in end 1 with the intakeopening for the uid passage in bottomgate 4.

Outlet pipes 25 and 26 connect the outlet ports in the other ends ofmold sections I and 2 with the passage 3| in end 1a.',of the yoke.Flexible means, such as metallic hose 21, connects the outlet from thecirculating passage in gate member 4 with the passage 3|. Outlet pipe2|, concentric with trimnion 6a of the yoke, connects with the passage3| and serves to lead the used cooling uid away from the moldingapparatus.

The trunnion mounting of the yoke enables the mold to be rotated to anydesired orientation and thus allows the cast cake to be dumped from thetop of the mold, as desired. Also a very simple mold assembly isprovided whereby the mold may be taken apart and machined or cleanedwhenever desired. This is done by removing the bolts 9 and disconnectingthe couplings, such as 32,'

in the inlet and outlet pipes between the yoke and the mold sections.

In operation, the mold may be mounted 'in a suitable casting machine orapparatus (not shown) and cooling water, or other liquid or gas, iscirculated through the passages of the yoke and .mold. The cooling waterwill enter the passage 36 in the end 1 of the yoke through intake pipe20. It is there divided into a plurality of parts, a portion of thewater passing through pipe 22 to the intake port of mold section whereit follows the several paths provided within the mold section and leavesthrough outletwpipe 25 leading to thepassage 3| in the end 1a of theyoke. Another portion of the cooling water passes through pipe 23 to theintake port of section 2 of the mold and after passing through thissection it is carried to the passage 3| by means of pipe 26. A stillfurther portion of the cooling water passes through the flexiblecoupling pipe 24 to the intake of the cooling passage in the gate member4. After passing through the cooling passage in the gate, this water iscarried to the passage 3| by means of the second flexible coupling 21.The used cooling water which co1- lects in passage 3| passes out throughoutlet pipe 2| concentric with the trunnion 6a.

Before casting, the bottom gate is swung into place against the bottomof the mold by means of lever I5 and is locked into place by thelatchv YI6 which is tightened by means of handle I9 attached to ythe eccentricsheave. v*The lining of casting space 3 is also preferably coated with amold dressing, such as graphite. The mold is then lled with molten metalin any desired manner well known to the art. After theake has beensuiiciently cooled by the .action of the cooling system it is thendumpedl When the cake is dumped from the top of the mold, the supportingyoke is rotated on its trunnions 6 `to such a position that the cakewill Aslide out by gravity. If the cake is to bedumped from the bottomof the mold, latch I6 is tripped'in any suitable manner thus allowingthe gate to swing back on its pivot shaft I4 whereupon the cake dropsfreely out of the bottom of the mold.

By this construction, a two-piece, parallelwalled, top andbottom-dumping, water-cooled mold having an improved form of yoke whichis ,20

provided with cooling passages is produced. The mold structure may alsobe easily assembled and taken apart whereby it may b e machined fromtime to time in order to true up the adjacent surfaces of the recessesforming the casting 25 chamber.

nWhile certain novel features of the invention have been disclosed andare pointed out in the annexedfclaims, it will be understood that varl,

ous omissions, substitutions and changes may be30 mold having coolingducts therein, a detachable 3 5.

supporting yoke therefor comprising two hollow ends and a plurality ofstruts connecting said ends, and means for conveying water through saidducts via the hollow ends of said yoke.

2. In metal casting apparatus, a two-piece mold comprising a firstsection and a second section, agate piece, a U shaped yoke for sup'porting said mold, cooling iiuid passages in said mold sections, saidgate piece and the arms of said yoke, and pipes connecting the passagesin said mold sections and gate piece to the passages in the arms of saidyoke.

3. In `a two piece water-cooled copper mold, two complementary sidewalls forming a casting cavity between them, said walls being parallelwhereby the cast copper cakes may be dumped from the top or the bottomof said casting cavity, water circulating passages in said walls havingin# lets at the bottom and outlets at the top thereof, a bottom gateclosing the lower end of said casting cavity, a water passage in saidgate, an inlet and an outlet to said passage, a U shaped yoke supportingsaid mold walls and said gate, water passages in the arms of said yoke,pipes connecting the passage in the first of said arms with said inlets,pipes connecting the passage in the other of said arms with `saidoutlets, and feed and drain pipes connected to said arm passages, re-

spectively.

WILLIAM H. PEIRCE.

